One has to understand that THY is hiring expat dec's the first time in their fairly long history. They simply don't have any experience in that field. I've been told by some friends at THY that the inhouse pilot union is everything else but happy with this developement. Fact is that all these shiny new airplanes are coming and someone has to fly them as well. Communication is not that easy and it takes quite a while to get answers.
I applied way before the agency got involved and it took 9 month after my sim. check and interview to get any answers. I didn't go because the offer is simply not good enough (yet). It has been improved slightly but is still not good enough for crew members that meet all theses high requirements (incl. age).
Don't forget that there'll be no chance whatsoever to change fleets (e.g. long haul). IST is probably one of the most exciting cities in the world but can also be very expensive.
Pilots in Turkey are still allowed to log 1000hrs/yr. Single aisle fleets are operating 24/7 and rosters are changing frequently.
You can rent a studio for 500 $ close to the airport but you can also rent for 5000 $. It's IST - nothing is impossible! Cars are expensive, food is cheap and life is good if you have spare cash.
Everybody who's interested needs to understand that it will be very hard to commute. There're very good private schools (expensive) so if I do the math again I find about 2000 reasons to improve the package.
Best of luck.